
%0 Journal Article
%A Grice, A. C. 
%A Campbell, S. D. 
%A McKenzie, J. R. 
%A Whiteman, L. V. 
%A Lukitsch, B. V. 
%T Size-biomass relationships for Australian populations of the invasive rangeland shrub <i>Parkinsonia aculeata</i> L.
%J The Rangeland Journal
%D 2002/11/20
%V 24
%N 2
%P 207-218
%K Parkinsonia, weeds
%R https://doi.org/10.1071/RJ02011
%U https://www.publish.csiro.au/paper/RJ02011 
%X Parkinsonia aculeata is an invasive, introduced shrub that is found in all mainland states of Australia except Victoria. It is especially prevalent north of the tropic of Capricorn. Size-biomass relationships were established for this species using data from 167 shrubs spread across eight sites in the Northern Territory and north-eastern Queensland. Above-ground dry weight (W, kg) can be predicted from plant height (H, m), canopy diameter (D, m) or stem cross-sectional area (A, cm2) using the equations: W = 0.025 H4.47 W = 0.091 D3.64 W = 0.022 A1.61 These relationships are linear when plotted on log-log scales. Although there was a significant effect of "site" on the log-log relationships between above-ground dry weight and size variables, the amount of information lost by not using site-specific equations is relatively small. These results provide reliable methods for estimating above-ground biomass in this species, the most robust being based on measurements of stem diameter at 20 cm above ground level. 
